Doctor profile · Federal record
Dr. Alexa Williams, MD
Obstetrics & Gynecology Physician (CMS: Obstetrics/Gynecology) · Obstetrics & Gynecology Physician · O Fallon, MO
- NPI 1972033652
- Accepts Medicare
- 9 yrs in practice
- Female
- Solo practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
1101 Highway K
O Fallon, MO 633668431
(636) 379-6363 - Additional location
-
12700 Southfork RD Ste 230
Saint Louis, MO 631283276
(314) 849-3711 - Additional location
-
615 S New Ballas RD
Saint Louis, MO 631418221
(314) 251-6062
fax (314) 251-4376 - Mailing address
-
Po Box 955534
Saint Louis, MO 631955534
Credentials & registration
- NPI registered
- June 2017 — 9 yrs on file
- Profile last updated
- November 10, 2025
- Year of graduation
- 2017 — 9 yrs since
- Specialty taxonomy
- 207V00000X — NUCC code
- State licenses (2)
- Missouri #2021013439 · Missouri #2017019537
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1972033652. Last verified May 11, 2026.Open Payments
Industry payments received
All-time total
$82
Transactions
5
Manufacturers
3
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Astellas Pharma US INC | 2 | $33.63 | |
| Hologic Sales and Service, LLC | 2 | $31.52 | |
| Pfizer INC. | 1 | $16.49 |
By nature of payment
Frequently asked questions
What is Dr. Alexa Williams's medical specialty?
Dr. Alexa Williams practices Obstetrics & Gynecology Physician in O Fallon, MO.
Where does Dr. Alexa Williams practice?
Dr. Alexa Williams practices at 1101 Highway K, O Fallon, MO 633668431. Office phone: 6363796363.
What is Dr. Alexa Williams's NPI?
Dr. Alexa Williams's National Provider Identifier (NPI) is 1972033652, issued by NPPES.
Does Dr. Alexa Williams accept Medicare assignment?
Yes. Dr. Alexa Williams accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.